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Tyler Hamilton long ago called Lance Armstrong a cheater. Now that Armstrong has said he won't contest the U.S. Anti-Doping Agency's case against him, Hamilton believes he has been proved right.

"Yeah, absolutely, I think it's given me a lot of credibility," Hamilton said Thursday in a phone interview. "People doubted me. OK, they should've doubted me.

"I lied to everyone who'd listen," he said, referring to his own doping. "But I think people, especially after reading the book, will know I'm telling the truth."

Hamilton's recently released book, "The Secret Race, Inside the Hidden World of the Tour de France," details Armstrong's doping during his string of seven Tour de France victories, as well as Hamilton's doping, for which he finally was caught.

Hamilton, 41, first went public charging Armstrong with doping on "60 Minutes" in May 2011.